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1.
One who looks fantastic from about a block away, but as you get closer to the person, he or she has major flaws; i.e. the beautiful tan skin is baggy or wrinkled, the bleached-blond hair is dry and straw-like, etc. The person is, overall, less hot than originally anticipated.
My neighbor's a one-blocker.
by Dirty Old Omer November 09, 2010